Controlled growth of polypyrrole microtubes on disposable pencil graphite electrode and their supercapacitor behavior

Pulse‐potential electrochemistry to boost real‐life application of pseudocapacitive dual‐doped polypyrrole

“…Figure 1F compares the FT‐IR spectra of PP‐PPy/FEG and CP‐PPy/FEG. Typical characteristic vibrations of PPy are observed in both electrodes, including =C–H out‐of‐plane vibration at 895 cm −1 , 36 N–H in‐plane deformation vibration at 1065 cm −1 , 37 C‐H in‐plane vibration at 1250 and 1340 cm −1 , 38,39 C–N stretching in pyrrole ring at 1250 and 1340 cm −1 , 40–43 and C═C of PPy rings at 1636 cm −1 44,45 . It verifies the successful preparation of PPy through both pulsed/conventional potentiostatic polymerization method.…”

“…Typical characteristic vibrations of PPy are observed in both electrodes, including =C-H out-of-plane vibration at 895 cm −1 , 36 N-H in-plane deformation vibration at 1065 cm −1 , 37 C-H in-plane vibration at 1250 and 1340 cm −1 , 38,39 C-N stretching in pyrrole ring at 1250 and 1340 cm −1 , [40][41][42][43] and C═C of PPy rings at 1636 cm −1 . 44,45 It verifies the successful preparation of PPy through both pulsed/conventional potentiostatic polymerization method. In addition, Raman spectroscopy of PP-PPy/FEG exhibits two characteristic peaks at 1345 and 1575 cm −1 , attributed to the π-conjugated planar structure and ring stretching of the pyrrole backbone respectively (Figure S5).…”

Scalable Flowing Polymerization and Enhanced Capacitive Properties for Core–Shell Structured Composite Nanofibers toward Highly Efficient Charge Storage in Neutral Electrolytes

“…The highest energy density of 14.8 Wh kg –1 with the power density of 343.1 W kg –1 could be achieved for the III–PANi/PPy, benefiting from its large electrochemical active area between the electrode and electrolyte and fast charge transfer along the nanofibers. This value was better than 12.6 Wh kg –1 at 160 W kg –1 for PPy prepared by low–temperature modified vapor phase synthesis, 10 Wh kg –1 at 1500 W kg –1 for PPy microtubes by potentiostatic deposition, 9.86 Wh kg –1 at 1775 W kg –1 for PPy nanonet by vapor/liquid polymerization, 10.65 Wh kg –1 at 258.26 W kg –1 for PPy/graphene oxide/zinc oxide nanocomposite deposited on a flexible nickel foam, 13.35 Wh kg –1 at 322.85 W kg –1 for PPy and reduced graphene oxide on the surface of carbon bundle fiber, 8.3 Wh kg –1 at 47.3 W kg –1 for PPy@carbon nanotube/bacterial cellulose macrofibers, 5.1 Wh kg –1 at 1500 W kg –1 for PPy@graphene oxide composite paper electrodes and 3.3 Wh kg –1 at 600 W kg –1 for PPy wrapped nitrogen-containing PANi-based carbon nanospheres . Clearly, the III–PANi/PPy had outstanding electrochemical performance, which could be attributed to highly conductive PPy in neutral aqueous electrolytes, better utilization of the nanoscale PPy shell, and strong synergistic interaction between the PANi core and PPy shell.…”

A simple solution combustion method for the synthesis of V2O5 nanostructures for supercapacitor applications

“…At higher scan rates the electrodes show a poorer electrochemical performance with lower capacitances and lower material conductance [17,30]. This occurs due to the increase in interfacial tension and resistances, that bring lower electrolyte transport and an inadequate counter particle redox reaction [31]. The intercalation and deintercalation of K + cations from the electrolyte into the V 2 O 5 grid, indicate the pseudocapacitive characteristics of the electrodes, causing the sharp redox couplings within the applied potentials [17].…”